The rapid change in the agro ecosystem leaves a snag in the establishment of harmony the discard of the disturb ecosystem due to wide usage of chemical pesticides fertilizers and synthetic plant growth regulators. The long term effect were overlooked hence boom of one time become bane for the ecosystem degradation. At the present context it has become indispensable to look for sustainable crop protection management approaches for disease management and the present book is an effort to this direction. The diseases of economic importance caused by fungi, bacteria viruses and virus like organisms of each crop are covered describing their history distribution losses incurred symptoms latest diagnostic tools epidemiology and integrated applied management approaches including cultural chemical genetic resources use of bio control agents being adopted world wide. The layout of each chapter includes a brief introduction and pathogen wise description of the diseases. Some chapters are vividly illustrated with photographs of typical symptoms graphs tables and line drawing to make the subject more interesting and easy to understand for students scientists planners, administrators growers and other end users with latest pertinent references.